They're not LITERALLY stranded in Thailand of course.
SOME of them really can't go back to Russia if they want to avoid being conscripted, jailed, or murdered.
Yes many Russians who really shouldn't be going back do run out of money / visa options and do go back.
Over time there will be more of those unfortunates.
Many can avoid going back for a long time or even indefinitely with visa options they might be able to afford, moving along from one country to the next mixed with maximum visa runs, merit based immigration if highly skilled, or seeking asylum in a western country if they have a strong case.
Every Russian has their own story.